Dipping mechanism.



"M. F. DAVORAN DIPPING MECHANISM.

APPLICATION FILED AUG.3, 1917.

Patented Jan. 29, 1918.

3 SHEETS-SHEET I.

A 20: for:

M. F- DAVUBAN.

DIPPING MECHANISM.

APPLICATION FILED AUG.3'| l9? 7 1,255,083. Patented Jan. 29,1918.

3 SHEETS-SHEET 2 M. F. DAVbRAN.

DIPPING MECHANISM. APPLICATION FILED AUG-3. I9 I7.

Patented Jan. 29, 191&

3 SHEETS-SHEET 3- ED STATES PATENT OFFICE.

MICHAEL F. DAVORAN, OF CINCINNATI, OHIO, ASSIGNOR TO THE CRANE & BREED MANUFACTURING COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

mrrme MECHANISM.

Specification of Letters Patent.

Application filed August 3, 1917. Serial No. 184,266.

To all whom it may concern:

Be it known that I, MICHAEL F. DAVORAN, a citizen of the United States, residing at Cincinnati, in the county'of Hamilton and State of Ohio, have invented certain new and useful Improvements in Dipping Mechanism, of which the following is a specification.

My invention is applicable in various relations, in which it is desired to coat articles, especially for supporting and carrying articles being electro-plated, and is exemplified 1 as employed in such relation, the method and apparatus for effecting the electro-plating being more clearly shown, described and claimed in my co-pending a plication, filed in the United States Patent gflice August 3, 1917, as Serial No. 184,265.

Myinvention has for its object the provision of means whereby the ascent and the descent, respectively, of the articles being operated on is caused within a short distance of forward movement of the articles, and whereby further, the ascent and the descent, respectively, of the articles is accomplished w1th an easy movement and wlthout jar, so as to insure maintenance of connection on their supports of the articles being coated.

It is the object of my invention further, to provide novel means whereby the articlesupports are maintained in the true lines of their forward paths of travel during raising and lowering of the same; further, to provide novel means whereby the articlesupports are caused to travel in a plurality of elevated paths; further, to provide novel means whereby the article-supports are maintained in an elevated path of travel; further, to provide novel means for releasing said article-supports and permitting descent thereof; and, further, to provide novel means for cushioning the descent of the article-supports; and the invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Figure 1 is a front end elevatlon of my improved device.

Fig. 2 is a rear end elevation, exemplifying the operatingparts of the same.

Fig. 3 is a plan view of the latter.

Figs. 4 and 5 are details in cross-section, respectively taken on the lines Hand 5-5 .of Fig. 1.

Fig. 6 is a side elevation of my improved device, partly broken away, exemplifying the means for elevating the article-supp0rt into latched relation.

Fig. 7 is a similar view, exemplifying the relation between the latched article-support and its latching means and a supplemental track arranged to permit descent of the article-support.

Fig. 8 is a side elevation of the same, partly broken away, with the article-support in unlatched relation. V Fig. 9 is a side elevation of the same, showing the article-support in lowered relation.

Fig. 10 is a plan view detail of the propelling means for the article-carrier.

Fig. 11 is a rear side elevation of the tripping means for the article-support.

Fig. 12 is a detail in cross-section taken on the line 12-12 of Fig. 9.

Fig. 13 is an axial section of the articlesupiport, taken on the line 13-13 of. Fig. 1; an

Fig. 14 is a cross-section of the same taken on the line 141& of Fig. 13.

The articles being coated may be of any desired shape or size and arranged to receive any suitable coating. The articles are exemplified as small pieces of hardware 15, for instance, casket-hardware.

The articles are arranged to be suitably supported on or secured to article-carriers 16, of which a suitable number are provided, as more fully shown and described in my aforesaid co-pending application, for insuring continuity of operation.

These article-carriers are exemplified as suspended carriers, being provided with flanged wheels 17, which move along a pair of tracks 18, suspended by suitable hangers 19 in suitable manner, as from the ceiling of the room in which the tanks are located. These tanks may be instanced as cleansing,

rinsin and plating tanks, for instance, as

26 which is suspended by a bearing 27 from an axle 28, to which the flanged wheels 17 are secured. The axle is journaled in said bearing.

The main frames of adjacent carriers are connected by the links of a suitable sprocketchain 31, which is preferably an endless link chain having a path coincident of endless tracks 18. The tracks are arranged so as to carry the articles being operated upon lengthwise of the series of tanks and other apparatus coacting with said articles, for forming a closed path of movement, and may be extended in suitable directions or along curves for the purpose. (See Figs. 3 and 10.)

Suitable means are provided for operating the, link chain, as by means of suitable sprockets 30 suitably'placed and rotated, for instance, as more fully shown and described in my aforesaid application.

The main frame 26 may comprisea link 32 of the link chain, to which latter the respective upper and lower sections of the main frame are secured by means of bolts 33. (See Figs. 1 and 7.) i

The main frame comprises a depending guide 36 with which a supplemental frame, exemplified as a supporting rod 37, has guided movement, as by being received in a guide-groove 38 of said guide and held therein by means of straps 39. (See Figs. 1, 2 and 5.) The lower part of said supplemental frame is provided with a fork 40 in which an insulat ng spool 41 is secured, as on a pin 42 received in bearings 43 inthe tines of said fork. (See Figs. 1 and 5.)

An article-support 44 is shown as provided with pins 45 over which the articles are received for supporting the same. When employed for electro-plating the articles make electro-conductive contact with the pins. For this purpose the pins extend from cross-bars 46 projecting from a center shank 47. The shank, cross-bars and pins are of electroconductive material and connect one with the other. Those portions of the shank and the cross-bars which are subject to the electrolytic action of the electrolyte of the plating baths, are provided with insulation, as shown by the insulating covering 48 about the shank, and the insulating coverings 49 about the cross-bars. These insulating coverings may be coatings of porcelain fused on the article-support. (See Figs. 13 and 14.)

The shank 47 of the article-support is provided with a hook 51 arranged to be releasably received over the insulating spool 41, being received in the annular groove 52 in said s 001, so that said shank is insulated from t e fork 40 by means of the bottom of said annular groove and the end flanges of said spool.

A sheave 55 is fixed on a shaft 56 journaled in a bearing 57 of a bracket 58, extendwith the pair neeaose ing from the main frame. This shaft has a pinion 59 fast thereon. A. flexible connection 61 is secured to the sheave, asat' 62, and to a lug 63 extending from the supplemental frame 37, so that when the sheave is turned the flexible connection is received in the groove 64 of the sheave for changing the elevtion of the article-support. .(See Figs. 1, 2 and 3.)

The axis of rotation of the sheave is located in advance of the depending guide 36, so that the depending portion of the flexible connection 61 is tangential to the peripheral groove in said sheave and parallel with said guide for exerting a steady pull on said flexible connection 61 when the sheave is turned, in order to prevent clamping or binding between the supplemental support and its guide.

A lever 66 is pivoted on a stud-shaft 67 fixed in a bearing 68 in the bracket 58. The lever comprises a gear 69 which meshes with the pinion 59.

The swinging of the lever causes changing of the elevation of the article-support. This is shown accomplished by means of supplemental tracks, preferably in such manner as to cause a swihging of the lever to difl'erent extents at diflerent positions along the main track for controlling the elevations at which the article-supports travel at diflerent portions of their path, and for causing coaction between the lever and a latch for locating the lever in actuated osition.

The swinging end of the lever is provided with a roller 71 journaled on a pin 72 in a fork 73, at the free end of the lever, the fork being preferably located to one side of the main portion of the shank of the lever. Figs. 1, 2, 3 and 4.)

The roller 71 normally rides on the under surface of one of the main tracks 18. When it is desired to change the elevation of the article-Support, instanced as a raising of the article-support, the roller is arranged to contact a supplemental track 76, exemplified as a deflecting track, which will move the lever to an intermediate position and raise the article-support to an intermediate elevation, or the roller is arranged to contact a supplemental track 75, exemplified as a de- (See fleeting track, which will move the lever for raising the article-support to its highest elevation, in which it is preferably latched for continued traveling at that elevation.

The supplemental track 7 6 may, if desired, be provided with a continued portion 77 for causing travel of the article-support at one of its elevations, and if desired, the supplemental track 76 may be provlded with a retreating portion 78 for permitting return of the lever to normal position and descent of the article-support. (See Figs. 7 8 and 9). V

This arrangement provides means whereby a quick raising and a quick descent of the article-support is accomplished, for causing the entire rising and descending movements within a short range of the progressive travel of the article-support, with the result that substantially the entire length of the tanks is employed for effective coaction of the baths therein with the articles.

Inorder to prevent jarring of the articlesupport when raised or. lowered, and especially to provide for a quick lowering without jarring movement of the article-support, I provide cushioning means, these cushioning means being exemplified as a spring 81, one end of the spring being received in a hole 82 of the lever, and the other end of the spring being hooked into an eye-bolt 83 having adjustable connection by means of a nut 84 with a lug 85 of the main frame, for providing adjustment of the tension of the spring.

I have found it desirable that the articlesupport -may throughout portions of the travel of the same, be maintainedin raised relation without necessity of continued riding if the roller 71 along a supplemental track. For accomplishing this I provide the supplemental track 75, (see Fig. 6), which has a deflecting portion for deflecting the lever 66 to greater extent than the same is deflected by the supplemental track 76, and incidentally raising the article-support to slightly greater elevation than said artiole-support is ,raised' by the supplemental track 76. The supplemental track 75 is arranged to move the lever 66 to sufficient extent to cause coaction between the lever and a latch 88 which coacts with a keeper 89 on the lever. This latter relation is exemplified in Fig. 6, the same relation being maintained in Fig. 7, whereas in Fig. 8 the latch is exemplified as released and the article-' support in its intermediate elevation, determined by contact of the roller 71 with the supplementaltra'ck 76.

The latch 88 is instanced as having a bearing 90 about a pin 91 in a lug 92 extending from the main frame. A stop 93 coacts with the heel 94 of the latch. A spring 95 is received about the pin 91 and has'one end thereof hooked about the stop 93 and the other end thereof hooked about the latch for normally causing coaction between the heel 9 1 and the stop 93.

It is desirable to maintain proper relation between the carrier and the main tracks during operation of the lever, by preventing a swinging of the carrier about a vertical axis during swinging movement of the lever, the lever being shown at one side of the carrier and to the side of the propelling chaintherefor. For accomplishing this, I provide the supplemental tracks as grooved tracks having the lengthwise groove 101 formed by the side flanges 102 of the U-bar which forms the supplemental tracks. A double flanged wheel 103 is instanced as on the shaft 56, being rotatable on said shaft, and held against endwise movement thereon by a collar 104 on said shaft. (See Figs. 1 and 12). The flanges ofthis wheel slope outwardly toward the ends of the wheel, as shown at 105, forming a spool-like arrangement, The inner faces of the flanges coact with the outer side edges of the flanges 102 of the supplemental track for locating the double flanged wheels centrally with relation to the track.

When in the travel of the article-carrier the roller 71 is received in the groove 101 of the supplemental track and the flanges of the double flanged wheel are received at the outside of the side flanges of said groove, the travel of the lever is maintained in a path parallel with the main tracks 18 for preventing a swinging of the, article-carrier on a vertical axis with relation to the tracks.

Means are provided for automatically releasing the latch 88 when the article-carrier shall have arrived at a position making it desirable to cause descent of the article-support, the tripping of the latch being preferably accomplished during coacting relation of the lever with a supplemental track 76, so that, when the latch is released, but slight instant movement of the lever can take place. The release of the latch is exemplified as accomplished by means of a trip 107 pivoted in a bearing 108 secured to one of the supplemental tracks 76 of the apparatus, and having a tripping nose 109 and a tailpiece 110.

When the articlecarrier arrives at proper position for the tripping movement of the lever, the tail-piece 110 is engaged for moving the tripping nose 109 into the path of the latch 88, for instance, by engagement of the hub 111 of the lever with the tail-piece. (See Fig. 11.)

It will be assumed that in operation the lever 66 has been latched by the latch 88. (See Fig. 6.) In the course of travel of the article-carrier, the article-support arrives adjacent to a tank 21, which may be a suitable cleansing tank, rinsing tank, plating tank, or other suitable tank, containing a suitable bath in which it is desired to im merse the articles on the article-support. Adjacent the arrival of the article-support at the beginning of the tank, the tail-piece 110 of the trip 107 is engaged by the hub 111 of the lever 66, whereby the nose 109 of the' trip is moved into position to obstruct the latch 88, whereby to trip said latch and Upon further progressive movement of the article-carrier in its path along the main tracks, the roller 71 moves along the retreating portion 78 of the supplemental track 76 for causing descent of the article-support into the tank, (see Figs. 8 and 9), the relations of the parts being such that a great range of descending movement is accomplished during a slight progressive movement of the article-carrier, so that the articlesupport may be immersed in the bath of the tank while still adjacent to the entering wall of said tank, thereby providing for a maximum coaction between said bath and the articles on said article-support.

The ascent of the article-support after the same has traveled lengthwise of the tank,

is accomplished during a slight progressive a Supplemental suspension frame, a pivoted movement of the article-carrier, by engagement of the roller 71 with the deflecting portions of either the supplemental track 7 6 or the supplemental track 75.

The supplemental track 76 is preferably employed when it is desired to cause raising movement of the article-support from one tank and descending movement of the article-support into another closely adjacent tank, as by passing over the dividing wall 112 between the same, the length of the continuing portion 77 of the track being such as to correspond with the desired duration of elevation of the article-support.

The supplemental track 75 is employed when itis desired to maintain the articlesupport in elevated relation during a substantial progressive movement in the travel thereof, for instance, when it is desired to raise the article-support out of a tank, eX- emplified at 20, which. is distanced a substantial distance from a neighboring tank or which is the final tank in the series of tanks of the apparatus.

The'supplemental tracks'7 5, 76, are placed at suitable intervals lengthwise of the main tracks 18 for positioning the same in proper relation to the tanks and other devices with which the article-supports coact, for efiecting the raisingvand lowering of the articlesupports in proper timed relation to said tanks and other devices. v

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In dipping mechanism of the character described, the combination of a track, an article support, means causing travel of said article-support lengthwise of said track, means raising said article-support during said travel, latching means maintaining said articlesupport in raised position during travel ofthe same, and means causing raising of said article-support to an intermediate elevation and. causing travel of said article-support in said intermediate elevation.

naeaoes 2. In dipping mechanism of the character described, the combination of a track, an article-support, means causing travel of said articlesupport lengthwise of said track, meansv causing raising of said article-support during said travel to an intermediate elevation and causing travel of said articlesupport in said intermediate elevation, means raising said article-support, latching means maintaining said article-support in raised position during travel I of the same, and means automatically tripping said latching means.

3. In dipping mechanism of the character described, the combination of a track, an article-carrier suspended therefrom, means movlng said carrler along said track, sald' article-carrier comprising a main frame and actuating part having operative connection with said supplemental suspension frame and with relation to which said supplemental suspension frame has lengthwise movement for moving the latter relative to said main frame, and a supplemental track with which said pivoted actuating part coacts for causing movement of said supplemental suspension framejrelative to said main frame.

4. In dipping mechanism of the character described, the combination of a track, an article carrier suspended therefrom, means moving said carrier along said track, said article-carrier comprising a main suspension frame and a supplemental suspension frame, a pivoted actuating part having operative connection with said supplemental suspension frame for moving the latter relative to said main suspension frame, a supplemental track with which said pivoted actuating part coacts for causing movement of said supplemental suspension frame relative to .said main suspension frame, and a latch for maintaining said supplemental suspension frame in actuated relation on said main suspension frame during travel of said suspension frames.

5. In dipping mechanism of the character described, the combination of a track, an article-carrier suspended therefrom, a flexible connection causing travel of said article-carrier lengthwise of said track, said articlecarrier comprising a main frame, a supplemental frame and an article-support on said supplemental frame, an arm pivoted to said main frame having operative connection with said supplemental frame for changing elevation of the latter, supplemental tracks having difierent elevations relative to said main track for causing movement of said pivoted arm-to relatively different extents for moving said supplemental frame to different elevations, a latch locking said supplemental frame in one of said elevations, and a tri automatically releasing said latch.

' 6. In ipping mechanism of the character described, the combination of a track, an article-carricr suspended therefrom, a flexible connection causing travel of said article-carrier lengthwise of said track, said articlecarrier comprising a main frame, a supple mental frame and an article-support on said supplemental frame, an arm pivoted to said main frame having operative connection with said supplemental frame for changing elevation of the latter, supplemental tracks having different elevations relative to said main track for causing movement of said ivoted arm to relatively diflerent extents or moving said supplemental frame to dif--.

. operative connection with said suspensionrod, and a supplemental track with which the swinging end of said lever coacts for changing the elevation of said suspensionro 8. In dipping mechanism of the character described, the combination of a main track, an article-carrier suspended therefrom, means causing travel of said article-carrier lengthwise of said main track, said articlecarrier comprisin a main frame, a suspension-rod having s ide-connection therewith, a lever pivoted to said main frame having operative connection with said suspension rod, a supplemental track with which the swinging end of said lever coacts for raising said suspension-rod, and a spring between said main frame and said lever for cushionin descent of said suspension-rod.

9. n dipping mechanism of the character described, the combination of a main track, an article-carrier suspended therefrom, means moving said article-carrier lengthwise of said main track, said article-carrier comprising a main frame, an article-support having slide-connection therewith, a sheave rotatable on said main frame, a flexible connection between said sheave and said articlesupport, a lever pivoted to said main frame, gear-connection between said lever and sheave for operating the latter, and a supplemental track with which the free end of said leverco-acts 'for raising said articlesupport.

10. In dipping mechanism of the charac ter described, the combination of a main track, an article-carrier suspended therefrom, means moving said article-carrier havin lengthwise of said main track, said articlecarrier comprising a main frame, an articlesupport having slide-connection therewith, a sheave rotatable on said main frame, a flexible connection between said sheave and said article-support, a lever pivoted to said main frame, gear-connection between said lever and sheave for operating the latter, a supplemental track with which the free end of said lever coacts for raising said articlesupport, and a latch coacting with said lever for maintaining said article-support in raised position during travel of said articlesupport.

11. In dipping mechanism of the character described, the combination of a main track, an article-carrier suspended therefrom, means moving said article-carrier lengthwise of said track, said article-carrier comprising a main frame, an article-support having slide-connection therewith, a sheave rotatable on said main frame, a flexible connection between said sheave and article-support, a lever pivoted to said main frame, gear-connection between said lever and sheave for operating the latter, a supplemental track with which the free end of said lever coacts for raising said article-support, and a sprin between the free end of said lever and sai main frame for cushioning descent of said article-support.

12. In dipping mechanism of the charac-' ter described, the combination of a main track, an article-carrier suspended therefrom, means moving said article-carrier lengthwise of said track, said article-carrier comprising a main frame, an article-support slide-connection therewith, a sheave rotata le on said main frame, a-flexible connection between said sheave and article-support, a lever pivoted to said main frame,

gear-connection between said lever and sheave for operating the latter, a su plemental track with which the free end 0 said lever coacts for raising said article-support, a latch coacting with said lever for maintaining said article-support in raised position, and means at said main track coacting with said latch for automatically releasing said latch.

13. In dippin mechanism of the character described, t e combination of a track, an article-carrier suspended therefrom, means propelling said carrier along said track, said carrier comprising a main frame and an article-support, a sheave journaled in said main frame, a flexible connection between said sheave and article-support, a lever pivoted to said main frame, a supplemental track, and lateral positioning means between said supplemental track and the pivot-portion and between said supplemental track and the swinging portion of said lever for causing operative parallelism between the travel of said lever and said track,

and said supplemental track causing movement of the free end of said lever by travel of said lever lengthwise of aid supplemental track whereby to change the elevation of said article-support.

14. In dipping mechanism of the character support, a shaft to which said slieave is secured for rotating the latter,a pinion on said shaft, a bearing for said shaft on said mainframe between said sheave and said pinion, a lever, a shaft therefor on said main frame, a gear on said lever having meshing relation with said pinion, a roller on said lever coacting with one of said main tracks, a double-flanged wheel about said lastnamed shaft, the space between the flanges of said wheel and said roller being in a line with each other parallel with said main tracks, and a grooved supplemental track, the flanges of said double-flanged wheel coacting with the sides of said supplemental track, and said roller coacting with the walls of the groove in said supplemental track for changin the elevation of said articlesupport an maintaining said carrier in traveling relation.

15. In dipping mechanism of the character described, the combination of a pair of parallel main tracks, an article-carrier suspended between said tracks, said articlecarrier comprising a main frame, flanged wheels thereon coacting with said tracks, an article-support having slide connection with said main frame, a sheave, a flexible connection between said sheave and said articlesupport, a shaft to which said sheave is secured for rotating the latter, a pinion on said shaft, a bearing for said shaft on said main frame between said sheave and said pinion, a lever, a shaftr therefor on said main; frame, a gear on said lever having mesh ng relation with said pinion, a roller on said lever coacting with one of said main tracks, a double-flanged wheel about said last-named shaft, the space between the flanges of said wheel and said roller being in a line with each other parallel with said main tracks, a grooved supplemental track, the flanges of said double-flanged wheel co- .acting with the sides of said supplemental track, said roller coactln with the walls of the groove in said supp emental track for changing the elevation of said article-support and ma nt mmg said carrier in travel.- ingrelation, a latch coacting with said lever for maintaining said article-support in lastnamed position, and a trip at said main naeaoea track actuated by said carrier for automatically tripping said latch.

16. In dipping mechanism of the character described, the combination of a pair of parallel main tracks, an article-carrier suspended between said tracks, Said article-carrier comprising a main frame, flanged wheels the space between the flanges of said wheel and aid roller being in a line with each other parallel with said main tracks, a grooved supplemental track, the flanges of said double-flanged wheel coacting with the sides of saidsupplemental track, nd sald roller coacting with the walls of the groove in said supplemental track for elevating said article-support and maintaining said carrier in traveling relation, and spring means between said lever and said main frame cushioning descent of said article-support. a

17. In dipping apparatus, the comblnation of an article-carrier, means for causing travel of said article-carrier, an article-support carried by said carrier, and means for causing raising and lowering movement of said article-support comprising a sheave, a flexible connection between said sheave and said article-support, a lever for rotating said sheave, a track along which said articlecarrier travels, and means with which said lever has coaction for swinging the same. 18. In dipping apparatus, the combination of an article-carrier, means for causing travel of said article-carrier, an article-support carried by said carrier, means for causmg raising and lowering movement of said article-support comprising a sheave, a flexible connection between said sheave and said article-support, a lever for rotating said sheave, a track along which said articlecarrier travels, means with which said lever has coaction for swinging the same, a latch for maintaining said lever in swung relation, and means for automatically releasing said latch.

19. lln dipping apparatus, the combination of an article-carrier, a track, means for moving said article-carrier lengthwise of said track, said article-carrier comprising a main frame, an article-support movable up and down on said main frame, a sheave on said main frame, a flexible connection between said sheave and said article-support, a lever pivoted to said main frame and having operative connection with said sheave for rotating the same, means with which said lever coacts for lowering and raising said article-support, and spring cushioning means between said main frame and lever for cushioning descent of said article-support.

20. In dipping mechanism of the character described, the combination of a suspension frame, an article-support movable up and down thereon, means causing travel of said suspension-frame, a sheave journaled in said suspension frame, a flexible connection between said sheave and said articlesupport, a lever having operative connection with said sheave for rotating the same, and means arranged to be contacted by said lever for swinging the same whereby to change the elevation of said article-support.

21. In dipping mechanism of the character described, the combination of a suspension frame, an article-support movable up and down thereon, means causing travel 0 said suspension frame, a sheave journaled in said suspension frameya flexible connection between said sheave and said articlesupport, alever having operative connection with said sheave for rotating the same, means arranged to be contacted by said lever for swinging the same whereby to change theelevation of said article-support,

a latch for maintaining said lever in swung relation, and means for automatically releasing sald latch.

22. In dipping mechanism of the character described, the combination of a suspension frame, an article-support movable up and down thereon, means causing travel of said suspension frame, a sheave journaled in said suspension frame, a flexible connec tion between said sheave and said articlesupport, a lever having operative connection with said sheave for rotating the same, means arranged to becontacted by said lever for swinging the same whereby to change the elevation of said article-support, and spring means for cushioning movement of said lever.

23. In a dipping mechanism of the character described, the combination of a track,

an article-carrier suspended therefrom, means moving sald carrier along sald track, said artlcle-carrier comprislng a main frame and a supplemental suspension frame, a pivoted actuating part having operative connection with said supplemental suspension frame and with relation to which sald supplemental suspension frame has lengthwise movement for moving the latter to elevation relative to said main frame, and means with which said pivoted actuatlng part "00- acts for changing the elevation of said sup plemental suspension frame relative to sald' main frame.

In testimony whereof, I have signed my name in the presence of two subscribing witnesses.

v MICHAEL F. DAVORAN.

Witnesses:

' MAURICE STEINBERG,

THERESA M. SILBER.

hereunto 

